I have a Garmin 421 with a Blue chart chip . It is a fixed mnt. chart plotter . Screen is easy to read . The 421 is silly easy to use. I got a good deal on it from gpscity.com . Garmin was having a rebate on their Blue g2 charts . Buy the 421 ($300.) and the chip chart ($200.) . So my total cost was $300. Free shipping .